【正文】 ，具有良好 的導(dǎo)熱性和導(dǎo)電性，無磁性，可焊性基本良好。 目前，國(guó)外已有一部分效果較好的軟釬劑進(jìn)入市場(chǎng)，但價(jià)格較高，難以大批量使用。因此，要實(shí)現(xiàn)釬焊過程并得到質(zhì)量好的接頭，母材和釬料表面氧化膜的徹底清除是十分必要的 [1]。 母材表面氧化膜的存在，使得液態(tài)釬料不能潤(rùn)濕它們。X 射線衍射分析表明，鋁合金表面氧化膜為γ Al2O3 型氧化膜。 on specimen. From the microstructure result it be seen only a few residual oxide film at the interface of base metal and filler metals in the 8% level of NH4Cl,the solder can be well connected with the parent aluminium alloy. When NaF content was less than or higher than 2%, the oxide film can be found between solder and parent metal from the microstructure of the joints for the flux has low reaction temperature great difference with the melting point of solder. The spread area is being larger and the wetting angle less with the lifting of temperature, but the ultrahigh temperature will produce erosion and other defects. The elongation of holding time is propitious to the uniform of the structure, however, has little effect on the spread area and wetting angle. Keywords： chloride flux； wettability； temperature； holding time 緒 論 1 第 1 章 緒論 課題背景 鋁合金具有密度小、強(qiáng)度高和耐腐蝕等優(yōu)點(diǎn)，因而廣泛應(yīng)用于汽車、高速鐵路、車輛、航空航天和軍事工業(yè)。 關(guān)健詞 : 氯化物釬劑 潤(rùn)濕性 溫度 保溫 時(shí)間 重慶工學(xué)院畢業(yè)論文 Abstract II Abstract To meet requirements of lowtemperature soldering on aluminum alloy, the ingredient of solder and its performance were studied. ZnAl filler metal and flux manufactured with different position were utilized to measure the spread area and wetting angle of the flux on the LY12 board. In this paper, the effect of heatingup temperature and holding time on the solder’s wettability had been mainly researched. Results show spread area and wetting angle of filler metal is changing with the position of chloride flux. When NH4Cl content is 8%,NaF content is 2% and ZnCl2 content is 90% in the flux, the flux has such the best performance that are spread area is 1100mm2,wetting angle is 7176。 溫 度的提高可 以增加釬料的鋪展面積，減小潤(rùn)濕角，但過高的溫度會(huì)出現(xiàn)溶 蝕等缺陷。左右。 成分不同的氯化物釬劑的鋪展面積和潤(rùn)濕角各不相同 ，在所測(cè)試的釬劑中，當(dāng) NH4Cl含量為 8%、 NaF 含量為 2%和 ZnCl2含量為 90%，釬焊溫度為 390℃時(shí)，綜合性較 好。通過不同比例的釬 劑配方，采用 ZnAl 釬料，測(cè)試了釬 料在 LY12 鋁板上的鋪展面積和潤(rùn)濕角。 1 目 錄 摘 要 .................................................................. Ⅰ Abstract................................................................... Ⅱ 第 1 章 緒論 .............................................................. 1 課題背景 .......................................................................................................................... 1 鋁合金的性能和應(yīng)用 ...................................................................................................... 1 鋁合金的性能 .......................................................................................................... 1 鋁合金的應(yīng)用 ........................................................................................................... 1 鋁合金的釬焊 .................................................................................................................. 2 ZNAL釬料 ...................................................................................................................... 2 鋁合金釬劑 ....................................................................................................................... 3 鋁用有機(jī)軟釬劑 ....................................................................................................... 3 鋁用反應(yīng)釬劑 ........................................................................................................... 3 鋁合金低溫釬劑的研究現(xiàn)狀 ........................................................................................... 4 無機(jī)釬劑 .................................................................................................................................................5 有機(jī)釬劑 ................................................................................................................... 7 本文研究?jī)?nèi)容 ................................................................................................................... 7 第 2 章 材料和試驗(yàn)方法 ..................................................... 9 試驗(yàn)主要儀器 ................................................................................................................... 9 試驗(yàn)材料 ........................................................................................................................... 9 試驗(yàn)方法 ......................................................................................................................... 10 氯化物釬劑的配制 ................................................................................................. 10 軟釬劑性能的試驗(yàn)方法 ......................................................................................... 11 微觀組織觀察 ......................................................................................................... 12 第 3 章 低溫釬焊用釬劑研究 ................................................ 14 釬劑組分的性質(zhì)及確 定 ................................................................................................. 14 釬劑基本組元的選取 ................................................................................................. 14 去膜組元的選取 ..................................................................................................... 15 活性組元的選取 ..................................................................................................... 15 釬劑含量對(duì)釬焊性能的影響 ......................................................................................... 17 基本組元含量對(duì)釬焊性能的影響 ......................................................................... 17 去膜組元含量對(duì)釬焊性能的影響 ......................................................................... 19 2 活性組元 ZnCl2含量對(duì)釬焊性能的影響 ............................................................... 2